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Date: Thu, 22 Dec 2022 09:18:00 -0800
From: Peter Delevoryas <peter@....dev>
To: Paolo Abeni <pabeni@...hat.com>
Cc: sam@...dozajonas.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, joel@....id.au, gwshan@...ux.vnet.ibm.com,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] net/ncsi: Add NC-SI 1.2 Get MC MAC Address command
> On Dec 22, 2022, at 2:53 AM, Paolo Abeni <pabeni@...hat.com> wrote:
>
> On Tue, 2022-12-20 at 21:22 -0800, Peter Delevoryas wrote:
>> This change adds support for the NC-SI 1.2 Get MC MAC Address command,
>> specified here:
>>
>> https://www.dmtf.org/sites/default/files/standards/documents/DSP0222_1.2WIP90_0.pdf
>>
>> It serves the exact same function as the existing OEM Get MAC Address
>> commands, so if a channel reports that it supports NC-SI 1.2, we prefer
>> to use the standard command rather than the OEM command.
>>
>> Verified with an invalid MAC address and 2 valid ones:
>>
>> [ 55.137072] ftgmac100 1e690000.ftgmac eth0: NCSI: Received 3 provisioned MAC addresses
>> [ 55.137614] ftgmac100 1e690000.ftgmac eth0: NCSI: MAC address 0: 00:00:00:00:00:00
>> [ 55.138026] ftgmac100 1e690000.ftgmac eth0: NCSI: MAC address 1: fa:ce:b0:0c:20:22
>> [ 55.138528] ftgmac100 1e690000.ftgmac eth0: NCSI: MAC address 2: fa:ce:b0:0c:20:23
>> [ 55.139241] ftgmac100 1e690000.ftgmac eth0: NCSI: Unable to assign 00:00:00:00:00:00 to device
>> [ 55.140098] ftgmac100 1e690000.ftgmac eth0: NCSI: Set MAC address to fa:ce:b0:0c:20:22
>>
>> IMPORTANT NOTE:
>>
>> The code I'm submitting here is parsing the MAC addresses as if they are
>> transmitted in *reverse* order.
>>
>> This is different from how every other NC-SI command is parsed in the
>> Linux kernel, even though the spec describes the format in the same way
>> for every command.
>>
>> The *reason* for this is that I was able to test this code against the
>> new 200G Broadcom NIC, which reports that it supports NC-SI 1.2 in Get
>> Version ID and successfully responds to this command. It transmits the
>> MAC addresses in reverse byte order.
>>
>> Nvidia's new 200G NIC doesn't support NC-SI 1.2 yet. I don't know how
>> they're planning to implement it.
>
> All the above looks like a good reason to wait for at least a
> stable/documented H/W implementation, before pushing code to the
> networking core.
I guess that’s a good point.
>
>> net/ncsi/ncsi-cmd.c | 3 ++-
>> net/ncsi/ncsi-manage.c | 9 +++++++--
>> net/ncsi/ncsi-pkt.h | 10 ++++++++++
>> net/ncsi/ncsi-rsp.c | 45 +++++++++++++++++++++++++++++++++++++++++-
>> 4 files changed, 63 insertions(+), 4 deletions(-)
>>
>> diff --git a/net/ncsi/ncsi-cmd.c b/net/ncsi/ncsi-cmd.c
>> index dda8b76b7798..7be177f55173 100644
>> --- a/net/ncsi/ncsi-cmd.c
>> +++ b/net/ncsi/ncsi-cmd.c
>> @@ -269,7 +269,8 @@ static struct ncsi_cmd_handler {
>> { NCSI_PKT_CMD_GPS, 0, ncsi_cmd_handler_default },
>> { NCSI_PKT_CMD_OEM, -1, ncsi_cmd_handler_oem },
>> { NCSI_PKT_CMD_PLDM, 0, NULL },
>> - { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default }
>> + { NCSI_PKT_CMD_GPUUID, 0, ncsi_cmd_handler_default },
>> + { NCSI_PKT_CMD_GMCMA, 0, ncsi_cmd_handler_default }
>> };
>>
>> static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca)
>> diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
>> index f56795769893..bc1887a2543d 100644
>> --- a/net/ncsi/ncsi-manage.c
>> +++ b/net/ncsi/ncsi-manage.c
>> @@ -1038,11 +1038,16 @@ static void ncsi_configure_channel(struct ncsi_dev_priv *ndp)
>> case ncsi_dev_state_config_oem_gma:
>> nd->state = ncsi_dev_state_config_clear_vids;
>>
>> - nca.type = NCSI_PKT_CMD_OEM;
>> nca.package = np->id;
>> nca.channel = nc->id;
>> ndp->pending_req_num = 1;
>> - ret = ncsi_gma_handler(&nca, nc->version.mf_id);
>> + if (nc->version.major >= 1 && nc->version.minor >= 2) {
>> + nca.type = NCSI_PKT_CMD_GMCMA;
>> + ret = ncsi_xmit_cmd(&nca);
>> + } else {
>> + nca.type = NCSI_PKT_CMD_OEM;
>> + ret = ncsi_gma_handler(&nca, nc->version.mf_id);
>> + }
>> if (ret < 0)
>> schedule_work(&ndp->work);
>>
>> diff --git a/net/ncsi/ncsi-pkt.h b/net/ncsi/ncsi-pkt.h
>> index c9d1da34dc4d..f2f3b5c1b941 100644
>> --- a/net/ncsi/ncsi-pkt.h
>> +++ b/net/ncsi/ncsi-pkt.h
>> @@ -338,6 +338,14 @@ struct ncsi_rsp_gpuuid_pkt {
>> __be32 checksum;
>> };
>>
>> +/* Get MC MAC Address */
>> +struct ncsi_rsp_gmcma_pkt {
>> + struct ncsi_rsp_pkt_hdr rsp;
>> + unsigned char address_count;
>> + unsigned char reserved[3];
>> + unsigned char addresses[][ETH_ALEN];
>> +};
>> +
>> /* AEN: Link State Change */
>> struct ncsi_aen_lsc_pkt {
>> struct ncsi_aen_pkt_hdr aen; /* AEN header */
>> @@ -398,6 +406,7 @@ struct ncsi_aen_hncdsc_pkt {
>> #define NCSI_PKT_CMD_GPUUID 0x52 /* Get package UUID */
>> #define NCSI_PKT_CMD_QPNPR 0x56 /* Query Pending NC PLDM request */
>> #define NCSI_PKT_CMD_SNPR 0x57 /* Send NC PLDM Reply */
>> +#define NCSI_PKT_CMD_GMCMA 0x58 /* Get MC MAC Address */
>>
>>
>> /* NCSI packet responses */
>> @@ -433,6 +442,7 @@ struct ncsi_aen_hncdsc_pkt {
>> #define NCSI_PKT_RSP_GPUUID (NCSI_PKT_CMD_GPUUID + 0x80)
>> #define NCSI_PKT_RSP_QPNPR (NCSI_PKT_CMD_QPNPR + 0x80)
>> #define NCSI_PKT_RSP_SNPR (NCSI_PKT_CMD_SNPR + 0x80)
>> +#define NCSI_PKT_RSP_GMCMA (NCSI_PKT_CMD_GMCMA + 0x80)
>>
>> /* NCSI response code/reason */
>> #define NCSI_PKT_RSP_C_COMPLETED 0x0000 /* Command Completed */
>> diff --git a/net/ncsi/ncsi-rsp.c b/net/ncsi/ncsi-rsp.c
>> index 7a805b86a12d..28a042688d0b 100644
>> --- a/net/ncsi/ncsi-rsp.c
>> +++ b/net/ncsi/ncsi-rsp.c
>> @@ -1140,6 +1140,48 @@ static int ncsi_rsp_handler_netlink(struct ncsi_request *nr)
>> return ret;
>> }
>>
>> +static int ncsi_rsp_handler_gmcma(struct ncsi_request *nr)
>> +{
>> + struct ncsi_dev_priv *ndp = nr->ndp;
>> + struct net_device *ndev = ndp->ndev.dev;
>> + struct ncsi_rsp_gmcma_pkt *rsp;
>> + struct sockaddr saddr;
>> + int ret = -1;
>> + int i;
>> + int j;
>> +
>> + rsp = (struct ncsi_rsp_gmcma_pkt *)skb_network_header(nr->rsp);
>> + saddr.sa_family = ndev->type;
>> + ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
>> +
>> + netdev_warn(ndev, "NCSI: Received %d provisioned MAC addresses\n",
>> + rsp->address_count);
>> + for (i = 0; i < rsp->address_count; i++) {
>> + netdev_warn(ndev, "NCSI: MAC address %d: "
>> + "%02x:%02x:%02x:%02x:%02x:%02x\n", i,
>> + rsp->addresses[i][5], rsp->addresses[i][4],
>> + rsp->addresses[i][3], rsp->addresses[i][2],
>> + rsp->addresses[i][1], rsp->addresses[i][0]);
>> + }
>
> You must avoid this kind of debug messages on 'warn' level (more
> below). You could consider pr_debug() instead or completely drop the
> message.
Oh ok, I’ll change it to a debug message when I resubmit it.
Thanks for your comments!
>
> Cheers,
>
> Paolo
>
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